冻融循环及含水率对冰碛土力学特性影响

蒋婷婷; 潘华利; 艾一帆; 熊薇

doi:10.19509/j.cnki.dzkq.tb20220649

冻融循环及含水率对冰碛土力学特性影响

doi: 10.19509/j.cnki.dzkq.tb20220649

蒋婷婷^{1, 2, 3,},
潘华利^{1, 2, ,},
艾一帆^{1, 2, 3},
熊薇^{1, 2, 3}

1.
中国科学院水利部成都山地灾害与环境研究所, 成都 610041
2.
中国科学院山地灾害与地表过程重点实验室, 成都 610041
3.
中国科学院大学, 北京 100049

基金项目:

国家科技部项目"第二次青藏高原综合科学考察研究" 2019QZKK0902

国家自然科学基金项目 42077275

详细信息

作者简介:
蒋婷婷, E-mail: jiangtingting@imde.ac.cn

通讯作者:
潘华利, E-mail: hlpan@imde.ac.cn

中图分类号: TU43
计量
- 文章访问数: 39
- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2022-11-21
- 修回日期: 2023-03-31

Effect of freeze-thaw cycles and water content on the mechanical properties of moraine soil

JIANG Tingting^{1, 2, 3
,},
PAN Huali^{1, 2
, ,},
AI Yifan^{1, 2, 3},
XIONG Wei^{1, 2, 3}

1.
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2.
Key Laboratory of Mountain Hazards and Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Author Bio:
JIANG Tingting, E-mail: jiangtingting@imde.ac.cn

Corresponding author: PAN Huali, E-mail: hlpan@imde.ac.cn

摘要

摘要:
处在季节性冻土区的冰碛土受冻融循环作用影响显著, 极大地影响工程的稳定和安全。为了探究冻融循环作用及初始含水率对冰碛土静力学特性的影响, 以川西甘孜州海螺沟的冰碛土为研究对象, 通过开展不同冻融循环次数及初始含水率条件下冰碛土不固结不排水三轴试验研究冻融循环作用对冰碛土力学参数的影响。试验结果表明: 冻融循环作用下冰碛土应力-应变曲线为弱应变软化型; 随冻融循环次数增加, 冰碛土弹性模量、抗剪强度均呈现出先快速衰减后趋于稳定的变化趋势, 且初始含水率越大其力学指标衰减程度越大, 黏聚力呈负指数型函数降低, 而内摩擦角无明显变化; 采用指数型函数对抗剪强度、弹性模量试验值进行多元非线性拟合, 建立冰碛土力学参数与围压、含水率及冻融循环次数的关系表达式, 拟合效果理想, 可用于推算经历冻融循环后土体力学参数值; 冻融循环作用会使冰碛土力学性质显著劣化, 且劣化程度与含水率呈正相关。研究成果可为高寒山区工程设计与建设提供科学支撑。
- 冰碛土 /
- 冻融循环 /
- 含水率 /
- 力学特性 /
- 衰减规律
Abstract: Objective
Moraine soil in seasonal permafrost areas is significantly affected by freeze-thaw cycles, which greatly affects the stability and safety of projects.
Methods
To investigate the effect of freeze-thaw cycles and water content on the static mechanical properties of the soil, the influence of freeze-thaw cycles and water content on the mechanical parameters of Hailuogou moraine soil was studied via an unconsolidated-undrained triaxial test.
Results
The results show that the stress-strain curves of the moraine soil before and after freeze-thaw cycling exhibit weak strain softening. With an increase in the number of freeze-thaw cycles, the elastic modulus and shear strength of the moraine soil first rapidly decrease and subsequently tend to stabilize. The higher the water content is, the greater the decay degree of the mechanical parameters. As the number of freeze-thaw cycles increases, the cohesion decreases exponentially, while the friction angle does not change significantly. The exponential function is thus adopted for multiple nonlinear fittings of the shear strength and elastic modulus. The relationship between mechanical parameters and confining conditions pressure, water content, and freeze-thaw cycles are obtained and show good correlation, which can be used to deduce the mechanical parameters of moraine soil after freeze-thaw cycles. The freeze-thaw cycles weaken the mechanical properties of moraine soil, and the higher the water content is, the greater the degree of attenuation.
Conclusion
The obtained results and analyses can provide scientific support for engineering design and construction in alpine regions.
- moraine soil /
- freeze-thaw cycles /
- water content /
- mechanical property /
- attenuation pattern
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 取样地点(a)及海螺沟典型冰碛土样(b)

Figure 1. Sampling site (a) and typical moraine soil sample from Hailuogou (b)

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图 2 冰碛土颗粒级配曲线

Figure 2. Curve of grain size distribution

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图 3 磨西镇2016-2021年夏冬两季气温及试验温度

Figure 3. Temperature and test temperature in summer and winter in Moxi Town from 2016 to 2021

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图 4 准备试样

a.三轴试样; b.在低温试验箱中进行冻融循环

Figure 4. Preparation of specimens

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图 5 全自动三轴仪

Figure 5. Automatic triaxial instrument

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图 6 围压50 kPa冻融循环下冰碛土应力-应变关系

Figure 6. Stress-strain curves of moraine soil subjected to different freeze-thaw cycles under 50 kPa confining pressure

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图 7 围压100 kPa冻融循环下冰碛土应力-应变关系

Figure 7. Stress-strain curves of moraine soil subjected to different freeze-thaw cycles under 100 kPa confining pressure

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图 8 围压150 kPa冻融循环下冰碛土应力-应变关系

Figure 8. Stress-strain curves of moraine soil subjected to different freeze-thaw cycles under 150 kPa confining pressure

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图 9 围压200 kPa冻融循环下冰碛土应力-应变关系

Figure 9. Stress-strain curves of moraine soil subjected to different freeze-thaw cycles under 200 kPa confining pressure

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图 10 弹性模量取值示意图

Figure 10. Diagram of the elastic modulus values

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图 11 不同围压下冰碛土弹性模量与冻融循环次数关系曲线

Figure 11. Relationship between the elastic modulus of moraine soil and freeze-thaw cycles under different confining pressures

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图 12 不同冻融循环次数下弹性模量损伤率变化

Figure 12. Damage rate of the elastic modulus changes under different freeze-thaw cycles

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图 13 不同围压下冰碛土抗剪强度与冻融循环次数关系曲线

Figure 13. Relationship between the shear strength of moraine soil and freeze-thaw cycles under different confining pressures

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图 14 不同冻融循环次数下抗剪强度损伤率变化

Figure 14. Damage rate of the shear strength changes under different freeze-thaw cycles

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图 15 冻融前后冰碛土抗剪强度与弹性模量的关系

Figure 15. Relationship between shear strength and elastic modulus of moraine soil before and after freeze-thaw cycling

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图 16 冰碛土抗剪强度参数与冻融循环次数的关系曲线

Figure 16. Relationship curve between shear strength parameters and freeze-thaw cycles of moraine soil

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图 17 冰碛土抗剪强度及弹性模量多元非线性拟合曲面

a.抗剪强度随冻融循环次数、含水率变化曲面(σ₃=200 kPa); b.弹性模量随冻融循环次数、含水率变化曲面(σ₃=200 kPa); c.抗剪强度随冻融循环次数、围压变化曲面(w=18%); d.弹性模量随冻融循环次数、围压变化曲面(w=18%)

Figure 17. Multivariate nonlinear fitting surface for the shear strength and elastic modulus of moraine soil

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表 1 冰碛土基本物性参数

Table 1. Basic physical properties of the moraine soil

干密度/(g·cm^-3) 天然含水率/% 最优含水率/% 塑限/% 液限/% 相对密度

1.7 9.7~16.4 14.3 8.6 15.5 2.82

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表 2 静三轴试验方案

Table 2. Test procedure for static triaxial test

含水率w/% 围压σ₃/kPa 冻融循环次数N/次试样个数/个

10
14
18 50，100，150，200 0，1，2，3，6，9，12，15，20 36
36
36

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